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Class 11th

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6 months ago

Class 11th Maths

From first 100 natural numbers, 3 numbers are selected. If these numbers are in A.P., then the probability that these numbers are even is:

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Vishal Baghel

Contributor-Level 10

A: 3 numbers are in A.P.
B: 3 numbers are even
P (B/A) = n (A ∩ B) / n (A) = (²? C? + ²? C? ) / (? C? +? C? ) = (25 * 24) / (50 * 49) = 12/49

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Class 11th Maths

The statement p → (q → p) is equivalent is:

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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6 months ago

Class 11th Chemistry Classification of Elements and Periodicity in Properties

The five successive ionization enthalpies of an element are 710, 1414, 2550, 28124 and 33845 kJ mol?¹. How many moles of H?SO? will be needed to react completely with 4 moles of the metal hydroxide?

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Raj Pandey

Contributor-Level 9

As the difference in $3^{rd}$ $^{}$ and $4^{th}$ $^{}$ ionisation energy is high so atom contains 3 valence electrons. Hence, valency of the atom is 3 and the metal is trivalent. 4 mole of trivalent metal hydroxide will react with 6 mole of $H_{2} {S O}_{4}$ $_{}_{}$ , $(2 M (O H)_{3} + 3 H_{2} {S O}_{4} ? M_{2} {({S O}_{4})}_{3} + 6 H_{2} O)$

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6 months ago

Class 11th Redox Reactions

Volume strength of original peroxide solution is 16.8 V. Determine the molarity and normality of peroxide solution respectively:

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Raj Pandey

Contributor-Level 9

Normality $= \frac{Volume strength}{5.6} = \frac{16.8}{5.6} = 3$ $\frac{}{} \frac{}{}$

Molarity $= \frac{Normality}{n - factor} = \frac{3}{2} = 1.5$

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6 months ago

Class 11th Chemistry Hydrocarbon

The compound 'A' in the following Reaction is:
A →(1) O?, (2) Zn/H?O→ B + C
B →dil. KOH→ CH?-CH(OH)-CH?-CHO →HCN→ D
C →conc. KOH→ Benzyl alcohol + salt of Benzoic Acid
D →H?O?, Δ→ E

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Raj Pandey

Contributor-Level 9

Kindly consider the following Image

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6 months ago

Class 11th Chemistry

Which of the following statement is incorrect statement for photochemical smog?

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Raj Pandey

Contributor-Level 9

Photochemical smog has high concentration of oxidising agent like ${N O}_{2}$ $_{}$ and $_{}$ $O_{3}$ and is therefore called as oxidising agent.

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6 months ago

Class 11th Chemistry

Consider the following reaction:
(A substituted phenol reacts with H? and CrO?Cl to produce product 'P'.)
The product 'P' gives positive acetyl chloride test. This is because of the presence of which of these –OH group(s)?

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Raj Pandey

Contributor-Level 9

Kindly consider the following Image

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6 months ago

Class 11th Chemistry

Maximum number of different photons emitted when only two H atoms are placed in a container and each is present in 3rd excited state:

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Raj Pandey

Contributor-Level 9

$1^{st} H$ - atom

$n = 4$

$n = 1$

$4 \to 3,3 \to 2,2 \to 1$

$4 \to 1$ or $4 \to 3,3 \to 1$

or $4 \to 2,2 \to 1$

Hence, number of different lines possible $= 3 + 1 = 4$

Minimally, both can have same transition i.e $4 \to 1$ etc.

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6 months ago

Class 11th Chemical Equilibrium

A container contains O?, He and SO? gases such that mass of SO? is double the mass of O? and mass of He is half the mass of O? gas. The sum of mole fraction of all the gases is:

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Raj Pandey

Contributor-Level 9

Sum of mole fraction of all the gases is 1 .

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6 months ago

Class 11th Chemistry

Among the following statements, identify the correct set of statements:
(A) Size of Li is smaller than Mg
(B) Both Li and Mg form covalent compounds readily
(C) Both Li and Mg react with nitrogen and form nitride
(D) Oxides of Li and Mg do not combine with excess oxygen to give superoxides

Identify the correct option from below:

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